dummying 

A cheat in Halo 2 that exploits the Xbox Live network code to make a player invisible and invulnerable, allowing him to capture a flag in 15 to 20 seconds. It involves getting in and out of the passenger side of a Warthog repeatedly, then having a partner drive it to the base, at which point you take the flag, then take one step, which teleports you back to your base for the cap.

On a side note, Bungie has made dummying a bannable offense.

Dummying is one of the cheats that is slowly making Halo 2 into another Counterstrike.

dummying by Seer-of-Shadows February 20, 2005

dumming out 

A term used in Connecticut for the dance that was made in the 860 area code, particularly Hartford. It involves imitation of common activities such as making a Rubix cube and shooting guns.

"Yooo you saw how he was freaking it at the party? I wish I could dum out like 860 heads."
"I'm a pro at dumming out, play some Gangstalicious for me."
"You cant dum right my guy, you're from 203."

dumming out by Pepsitaylor December 14, 2017

Dumming

The feeling of wanting to kill a person

I got murder on my mind right now I’m dumming

Dumming by anonymous May 12, 2021